35. I think the NAS study was referring to regular ballistics, not microstamping.

Of course, it will not be perfect, but a stamp that shows up half the time is much better than no stamp, particularly if there are several casings at a crime scene, there's a good chance one of them will show up. And the technology will keep improving -- this is 2012, I'm pretty sure we can figure out how to stamp an identifier on a casing.

The NRA's talking points here remind me a lot of wall street banks arguing against financial regulations. They point to the fact that no regulation will be 100% effective, and there will always be ways to get around the laws and blah blah blah. This doesn't have to solve all crimes in order to be worthwhile.